Vitamins & Minerals

India has some of the highest micronutrient deficiency rates in the world, despite being a country with abundant sunshine and diverse traditional foods. NFHS-5 data puts anaemia at 57% in children under five and 53% in women of reproductive age. Vitamin D deficiency affects 70–90% of urban Indians despite ample sun exposure — skin tone, sunscreen use, air pollution, and limited outdoor time all suppress synthesis. B12 deficiency is near-universal among long-term vegetarians without supplementation.

These deficiencies reflect the combined effect of food processing, soil depletion, and dietary patterns that are technically varied but micronutrient-poor in specific ways. These guides examine each deficiency through the lens of Indian diet, sun exposure patterns, absorption factors specific to plant-based eating, and what the clinical evidence says about correcting them safely.

One systemic problem with vitamin management in India is that most pathology labs use reference ranges calibrated for Western populations. The "normal" range for 25-hydroxyvitamin D in most Indian labs starts at 20 ng/mL, but Indian endocrinology societies now recommend maintaining levels above 30 ng/mL for optimal musculoskeletal health. This means a report marked "normal" may still represent functional insufficiency. B12 deficiency is similarly underdetected — the lab threshold of 200 pg/mL captures only clinical deficiency, not the subclinical insufficiency that causes fatigue and cognitive symptoms, which begins at levels below 400 pg/mL.

The food-versus-supplement debate is nuanced for Indian micronutrient deficiencies. For some, food-first genuinely works: calcium from curd, sesame, and ragi is well-absorbed; iron from pomegranate and moringa combined with vitamin C improves bioavailability meaningfully. For others, supplementation is essentially unavoidable — B12 has no meaningful plant source, and vitamin D synthesis is suppressed by indoor work, skin tone, SPF use, and air pollution to a degree that diet cannot compensate. Zinc and magnesium fall in between — Indian diets are not as universally deficient, but athletes and those with high phytate intake often benefit from targeted supplementation.

Knowing when to retest and what to expect removes the guesswork from a supplement protocol. Vitamin D levels typically take 8–12 weeks of consistent supplementation to meaningfully rise — retesting at 4 weeks is too early and leads to incorrect dose adjustments. B12 repletion in deficient vegetarians usually shows improvement within 6–8 weeks of sublingual supplementation, though stores take longer to fully replenish. Iron repletion for anaemia requires 3–6 months of consistent supplementation plus dietary changes, with ferritin — not haemoglobin — as the target for full correction.